Abstract
Ex-situ acid treatment of surface of old natural cobblestones has been analysed as a new technique for pavements reuse according to environment risk. Cubes of granite, basalt, field stone and slag concrete previously removed from Old Town street, were exposed to: H2SO4(30%,96%), HNO3(30%,65%), 10%HF and 85%H3PO4 by 1–4 weeks to increase the surface roughness and improve the anti-slip properties. The use of HF and 30%HNO3 influenced increase of open porosity value (up to 2.5-fold). In turn, 30% and 65%HNO3 treatment increased the BET surface area and decrease micropore area and volume. Moreover, 30% HNO3 had the least negative effect on the Cr, Fe, Ni, Cu, Zn, Cd, Hg, Pb leachability. XRD, digital and SEM analysis confirmed the poor silica susceptibility (as main compound of analysed minerals) to 30%HNO3 treatment. This is the first work focused on use chemical treatment in such a way that the effect is only superficial, without affecting the integrity of the entire cube.
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